Additional information
I was silly enough to actually let OS X do an automatic update from 10.6.1 to 10.6.2 even though I knew perfectly well that it just would not work.

I remember reading some topic, somewhere, regarding how to perform that update in a safe manner. So now... my installation is completely broken. As soon as I boot the computer I get the old "press and hold down the power button to restart the computer, then press the power button again to start... (etc)" (the OS crashes due to some null pointer exception 0x000000000)

If anyone has any ideas/suggestions on how to get out of this predicament I will gladly try them. Otherwise I will have to perform a reinstall.

Thank you.

/Gash